Peugeot 208 Owner's Manual
See also:
Special position of the windscreen wipers
This position permits release of the windscreen wiper blades.
It is used for cleaning or replacement of the blades. It can also be useful,
in winter, to detach the blades from the windscreen.
...
Misfuel prevention (diesel)
Mechanical device which prevents filling the tank of a Diesel vehicle with petrol.
It avoids the risk of engine damage that can result from filling with the wrong
fuel.
Located in the filler neck ...